Introducing WaveSpeedAI LTX 2 19b LipSync on WaveSpeedAI

Introducing LTX-2 19B Lipsync: Audio-Driven Talking Head Video Generation

The line between static images and dynamic video content continues to blur with advances in AI. Today, we’re thrilled to announce the availability of LTX-2 19B Lipsync on WaveSpeedAI—a powerful audio-driven model that transforms reference portraits into synchronized talking head videos with remarkable fidelity and natural movement.

Whether you’re creating digital avatars, localizing content across languages, or producing educational videos at scale, LTX-2 Lipsync delivers professional-grade results through a simple REST API with no cold starts and affordable pricing.

What is LTX-2 19B Lipsync?

LTX-2 Lipsync is built on Lightricks’ groundbreaking LTX-2 foundation model—a 19-billion parameter Diffusion Transformer (DiT) architecture specifically designed for synchronized audiovisual generation. Unlike traditional lip-sync tools that simply animate mouth movements, LTX-2 understands the bidirectional relationship between audio and video: speech determines mouth movement while the visual context shapes how natural the result feels.

The model leverages an asymmetric dual-stream transformer architecture with bidirectional cross-attention layers and temporal positional embeddings. This technical sophistication translates to practical benefits: sub-frame precision in audiovisual alignment, natural head movements that accompany speech, and expressions that match the emotional tone of the audio.

The result is talking head videos that don’t just move lips—they feel alive.

Key Features

Audio-Driven Generation: Upload an audio file and optional reference image, and the model handles lip synchronization, head motion, and facial expressions automatically
19B Parameter DiT Architecture: The massive parameter count enables highly detailed, temporally consistent video with natural mouth movements that match speech patterns
Flexible Resolution Options: Choose from 480p (fast iteration), 720p (balanced quality), or 1080p (maximum detail) to match your workflow and budget
Variable Duration Support: Generate videos from 5 to 20 seconds, with length automatically determined by your audio input
Natural Expression Synthesis: Goes beyond basic lip movement to include subtle head tilts, eye movements, and facial expressions that accompany natural speech
Multilingual Support: Works across languages, handling the nuances of different speech patterns and mouth shapes

Real-World Use Cases

Digital Avatars and Virtual Presenters

Create consistent talking head videos for virtual hosts, brand ambassadors, or AI-powered customer service representatives. Maintain visual consistency across unlimited content while varying the spoken message.

Content Localization and Dubbing

Dub existing video content into new languages while maintaining the original speaker’s appearance. This is particularly valuable for global marketing campaigns, training materials, and entertainment content that needs to reach international audiences.

Produce engaging talking head content at scale for social platforms. Create personalized video messages, product announcements, or educational content without the overhead of traditional video production.

E-Learning and Educational Content

Generate instructional videos with consistent virtual presenters. Perfect for online courses, corporate training, and educational platforms that need to produce large volumes of video content efficiently.

Accessibility Applications

Create synchronized visual content for accessibility purposes, including sign language interpretation videos or narrated content with clear visual speech cues.

Getting Started on WaveSpeedAI

Using LTX-2 Lipsync through WaveSpeedAI’s API is straightforward. Here’s a simple example:

import wavespeed

output = wavespeed.run(
    "wavespeed-ai/ltx-2-19b/lipsync",
    {
        "audio": "https://your-audio-url.com/speech.mp3",
        "image": "https://your-image-url.com/portrait.jpg",
        "resolution": "720p"
    },
)

print(output["outputs"][0])  # Output video URL

The API accepts three key parameters:

audio (required): URL to your audio file—this drives the lip synchronization and determines video length
image (optional): URL to a reference portrait that defines the speaker’s appearance
resolution (optional): Output quality—480p, 720p (default), or 1080p

Pricing That Scales With Your Needs

LTX-2 Lipsync pricing is transparent and affordable:

Resolution	5 seconds	10 seconds	15 seconds	20 seconds
480p	$0.075	$0.15	$0.225	$0.30
720p	$0.10	$0.20	$0.30	$0.40
1080p	$0.15	$0.30	$0.45	$0.60

Start with 480p for rapid iteration, then scale to higher resolutions for final delivery.

Tips for Best Results

Use Clear, High-Quality Audio: The clearer your speech audio, the better the lip synchronization. Minimize background noise and ensure consistent volume levels.
Choose Front-Facing Portraits: Reference images with clearly visible mouths and neutral expressions work best. Avoid extreme angles or obscured faces.
Iterate at Lower Resolution: Dial in your results at 480p before rendering final versions at 720p or 1080p to save time and cost.
Use Fixed Seeds for Comparison: When comparing variations, set a fixed seed value to isolate the effects of other parameter changes.
Keep Audio Under 20 Seconds: Maximum video duration is 20 seconds. For longer content, generate multiple clips and combine them in post-production.

Why WaveSpeedAI?

Running LTX-2 Lipsync on WaveSpeedAI means you get:

No Cold Starts: Your requests begin processing immediately—no waiting for infrastructure to spin up
Fast Inference: Optimized infrastructure delivers results quickly, enabling rapid iteration
Simple REST API: Integrate lip-sync capabilities into your applications with just a few lines of code
Transparent Pricing: Pay only for what you generate, with no hidden fees or minimum commitments

Start Creating Today

LTX-2 19B Lipsync represents a significant step forward in accessible, high-quality talking head video generation. The combination of Lightricks’ advanced DiT architecture with WaveSpeedAI’s optimized inference infrastructure puts professional-grade lip synchronization within reach of any developer or content creator.

Ready to bring your images to life? Try LTX-2 Lipsync on WaveSpeedAI and experience audio-driven video generation that just works.